diff --git a/Doc/lib/libstat.tex b/Doc/lib/libstat.tex
index a1d8a78..3856723 100644
--- a/Doc/lib/libstat.tex
+++ b/Doc/lib/libstat.tex
@@ -14,13 +14,17 @@
 \renewcommand{\indexsubitem}{(in module stat)}
 
 \begin{funcdesc}{S_ISDIR}{mode}
-Return non-zero if the mode was gotten from a directory file.
+Return non-zero if the mode was gotten from a directory.
 \end{funcdesc}
 
 \begin{funcdesc}{S_ISCHR}{mode}
 Return non-zero if the mode was gotten from a character special device.
 \end{funcdesc}
 
+\begin{funcdesc}{S_ISBLK}{mode}
+Return non-zero if the mode was gotten from a block special device.
+\end{funcdesc}
+
 \begin{funcdesc}{S_ISREG}{mode}
 Return non-zero if the mode was gotten from a regular file.
 \end{funcdesc}
diff --git a/Doc/libstat.tex b/Doc/libstat.tex
index a1d8a78..3856723 100644
--- a/Doc/libstat.tex
+++ b/Doc/libstat.tex
@@ -14,13 +14,17 @@
 \renewcommand{\indexsubitem}{(in module stat)}
 
 \begin{funcdesc}{S_ISDIR}{mode}
-Return non-zero if the mode was gotten from a directory file.
+Return non-zero if the mode was gotten from a directory.
 \end{funcdesc}
 
 \begin{funcdesc}{S_ISCHR}{mode}
 Return non-zero if the mode was gotten from a character special device.
 \end{funcdesc}
 
+\begin{funcdesc}{S_ISBLK}{mode}
+Return non-zero if the mode was gotten from a block special device.
+\end{funcdesc}
+
 \begin{funcdesc}{S_ISREG}{mode}
 Return non-zero if the mode was gotten from a regular file.
 \end{funcdesc}